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19 Cards in this Set

  • Front
  • Back
what are the 3 anatomical divisions of the urinary tract
upper - minor calyces, pelvis, and ureters
bladder - stores urine under low pressure expels under high pressure
urethra - a conduit for carrying urine from the body; has 2 sphincters to control voiding
what does the parasympthetics do in the urinary tract
favors tinkling
increases the frequency of the peristatic contractions of the ureter
what does the sympathetics do in the urinary tract
decrease the peristaltic contractions of the ureter
the parasympathetic fibers of the pelvic nerve do what
stimulate the detrusor muscle and inhibit the contraction of the internal urethral sphincter
what does the sympathetic fibers of the hypogastric nerve do
they inhibit the detrusor muscle
and constrict the internal urethral sphincter
what does the somatic motor neurons of the pudendal nerve do
they are voluntary control. and they constrict the external urethral sphincter
as the radius increases during bladder filling what happens to the wall tension
it increases
T= (P*r)/2
during the later bladder filling what happens with increasing wall tension
more frequent stretch impulses from stretch receptors
does the bladder empty passively or actively
due to the law of LaPlace
T= (P*r)/2
what are the 4 abnormalities of micturition
uninhibited neurogenic
what causes atonic bladder
destruction of sensory inputs from bladder to sacral cords = the afferents
what does the bladder look like in an atonic bladder
it is flaccid and filled to capacity and eventually will become thin-walled and distended
what causes a denervated bladder
destruction of both the efferent and afferents
what does the denervated bladder look like
initially it is flaccid and distended but later the detrusor regains spontaneous activity; bladder shrinks and hypertrophies
what causes an automatic bladder
injury or severing above the sacral region- cuts off the communication with the brain
what occurs during the acute phase with an automatic bladder
spinal shock will temporarily suppress micturation reflex
will the micturation reflex recover in an autonomic bladder
yeah, but control by the brain is lost. if you tickle the groin area, pt can void due to voluntary control of the external sphincter
what is the uninhibited neurogenic bladder
destruction of tracts carrying inhibitory impulses from the brain; the micturation center is continually stimulated
what does the bladder of uninhibited neurogenic bladder look like
it is activated by small amounts of urine and therefore the detrusor muscle hypertrophies and the bladder capacity is reduced.